Improvement in vises



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@withy Letters .Pa'teut No. 78,746, dated Tune 9, 1868.

IMPROVEMENT IN VISES.

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dov- '.rO ALDWHOM IT MAY OONOERN:

Be it known that I, F. B. JOHNSON, of De Witt, in the county of Clinton,and State of Iowa, have invented a new and improved Vise; and I dohereby declarel that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art'to makeand use the same, reference being had to'theace'om. pany/ing drawings,forming part of this specification.`

The iigureis a lsideview of my improved vise, parte being broken away toshow the construction.

My invention has for its object to furnish a simple and convenientbench-vise, which shall be so constructed as to adapt itself to the.shape of the object to be held, whether said object be straightortaperilrg; and it'consists in the combination of the pivotedjaw,elbow-shank, clamping-screw, and spring, with each other, as hereinafter more fully described:

A isthe stationaryjaw, which is securely attached to the bench B in theordinary manner. C is an elbowshank, the lower or horizontal part or armof' which passes through a slot or hole in the lower partofth'estationary jaw A, and through the upper end' of which passes theclamping-screw D. E is the movable jaw, the lower part of which isslotted and recessed to receive'the upper or vertical part or arni ofthe elbow-shank C,.as shown in the figure. 4 l i l The lower end of therhovable jaw E is pivoted to the elbow-shank Q at its angle, as shown.in the gure.

By this construction, the upper part of thejaw E is forced forwardtoclamp the object to be held by the screw D, the forwhrd end of whichpresses against the bottom of the recess in the outer side of themovablejaw E, in which the upper end of the elbow-shank C rests.

F is a spring, oneend of which is attached to the lower part ofthevertical arm of the elbow-shank 0,-and' the other end of which restsagainst the inner side of the upper part of th'e movable 'pivoted-jaw E,to hold the said close up against the end of the clamping-screw D, andthus to withdraw the said jaw from the object being held as the saidscrew is turned back. i I

Irelaixn as new, and desire to secure by Letters Patent- 1. Theelbow-shank C and Imovable jaw E, 'constructed and arrangedsubstantially as herein shown and described, in combination with eachother, and with thestaticnary jaw A and lclamping-screw D, as and 1forthe purpose set forth'. 1 I

2. The combinationof the spring F with the elbow-shank C, and with thepivoted movable jaw E and screw D, arranged substantially as hereinshown and described, and for` the purpose set forth.

The above specification of myinrention signed by mc, this 21st day ofMarch, 1868'.

' F.B. JOHNSON..

4 Witnesses:V

Z. PLUMB, L. F. BROWN.

